Rotary kiln.



F. TSCHIRNER.

ROTARY KILN;

APPLICATION FILED APR. I3 19!?- 1 ,292,927 Patented J an. 28, 1919.

DEBICK TSOBIBNEB, OF NEWARK, NEW JERSEY, ASSIGNOR TO RICHARD G.

WAGIKB, 0! new YORK, N. Y.

.. norm? mu.

Appllcaflon'fled April 13, 1917. Serial No. 161,852. y e

To all whom it may concern:

Be it known that I, Fnnnnnrox Ts a citizen of the United States, resi aNewark, in the county of Essex and tate of New Jersey, have inventedcertain new and useful Improvements in Rotary Kilns; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the-same.

The present invention concerns an apparatus for the heat treatment ofmaterials, and is particularly designed for use in connection with theheat treatment of a mixture of greensand, lime sand and salt, inaccordance with the process of my copending application filed of evendate herewith.

In the accompanying drawing, Figure 1 shows a vertical section of thelower end of the rotary kiln and the connections at the said lower end,and Fig. 2 shows a horizontal section taken on the line 2-2 of Fig. 1,looking downwardly.

In said drawings 10 is a rotary kiln of any desired structure, rotatedby a suitable mechanism commonl employed in the art, and which accordingy it is not necessary to illustrate. The lower end of the said rotarykiln projects into a housing 11, which may be lined with heat resistantand heat in- "sulating material 12, to prevent undue 10$ of heat byradiation.

At 13 is illustrated a burner for heating the material being fed throughthe rotary kiln, this being for example a gas, coal or oil burner of anyapproved type: Surrounding the burner and proje toward the 0 en mouth ofthe kiln 10 is a sleeve 14, w ich may be made of refractory tile orsimilar material, the function of which is to choke the flame andprevent the same from spreading, so 'thata com 'vel long and narrowflame will be .produce which need not come into direct contact with thematerial bein calcined in the rotary kiln. Suitable va ves will beprovided for regulating the air and gas or air and oil supplied to theburner.

At 15 I have illustrated' another burner, which if desired may be of'amuch smaller size than that shown at 13, this burner being for thepurpose of-heating the ma erial after passing through the rotary kiln.

The materlal calcined in the kiln 10 drops into the receptacle 16,provided with a gate 17 the material to slowly feed from the com-Speelflmflan 011cm" Patent Patented J an. 28, 1919.- v

partment 16 to the conveyor, and to retain a relatively large body ofmaterial in 16.

Receptacle 16 may be made of any suitable fire resistant material, suchas t' e, and

the function of this receptacle is to retain the calcined material for aconsiderable time, in a heated condition, and the burner 15 may beregulated so as to maintain the material in the compartment 16 at thesame temperature at which it leaves the kiln 10,

or at slightly higher or slightlylower temperatures, as desired.

The products of combustion from the burner 15 pass around the receptacle16, may be directed forward and backward by bafiles 21 having openings22, and may be discharged at 19, and flow into the kiln 10, or theseproducts ofcombustion may be separately drawn off, if so desired.

What I claim is:

1. An apparatus of the character described comprising an inclined rotarykiln, a burner located opposite the mouth of said kiln for heating thesame, a receptacle at the outlet end of said kiln for collecting andholding the material coming from said kiln, and means for indirectlyapplying heat to such material, for maintaining its temperature, whileout of contact with direct heating means, and while avoiding rapid rentsof gases in contact with the material.

2. In a calcining apparatus, an inclined rotary kiln, a burner locatedopposite to and at a distance from the mouth of said L mg a flame intothe said kiln, in countercurrent with the solid material being calcinedtherein, and external heating means only for said receptacle.

4. An inchnecl substantially cylindrical rotary kiln, a burner fordirectin a flame into the lower end thereof, said klhl being connectedat its lowerend with a receptacle,

maaeav FREDERICK 'rsomna'nn.

